Currently, you can choose in the scheduled monitoring to:
Receive one email on status changes
Receive one email when service goes down
Receive email any time service is down
What is missing (and I assume is important for everyone to not miss down monitorings):
Receive email any time service is down AND when service is up again
So you'd like to get email continually when a service is down, and one more time when it comes back up?
exactly.
Should be do-able ... I'll add this to my todo list.